Blonde, brunette and now red

So I'm really not that sentimental about the whole "Oh, don't dye your hair" thing. I understand that hair dye isn't 100% good for you but who cares! We have one body, dye your hair, get that earring! If you don't like it, you can always change it back.

With this being said, I've had about every colour under the sun. Now, before we start, this is my natural hair colour (light brown):

However, throughout the years, I've done a bit of experimenting. In 2013 I was blonde:

When I look at these photos now I cringe.

Then, I decided to go a bit darker:

Then I decided to go much darker:

Today, I have red hair:

So I really like the red but what do you think?

Blonde, light brown, dark brown or red?

Please comment and share your opinion!